* lisp/help-fns.el: Fix missing dependency

diff --git a/lisp/help-fns.el b/lisp/help-fns.el
index 3c0a72e26343c429107d393e9ff7568d58125aa0..d6b4e763bbc5cb2ea0f4d6021e82af0dc307e0a7 100644 (file)
--- a/lisp/help-fns.el
+++ b/lisp/help-fns.el
@@ -35,6 +35,7 @@
 (require 'cl-lib)
 (require 'help-mode)
 (require 'radix-tree)
+(eval-when-compile (require 'subr-x))   ;For when-let.
 
 (defvar help-fns-describe-function-functions nil
   "List of functions to run in help buffer in `describe-function'.